I WOULD be a professional student, if I could! Having said that, as a physician, I took alot of courses that, looking back, were a huge waste of time and taught me little in terms of knowledge or skills.
I took 2 years of Calculus-based physics- which I never remotely use in my daily practice! Or the year of organic chemistry. Etc. And when I started my internship, on the first day of being a "real" doctor, someone had to show me how to write a prescription!
I do support learning interesting things for the sake of learning. My son and I are studying geography nightly with the idea that he will enter a Geo Bee, and we are reading a History of the World together. Lots of "useless," but interesting facts. However, there are classes you have to take in school/college, etc. that, in my opinion, are a waste of time!